How did smallpox, measles, and other introduced diseases affect Northwest Coast peoples?

Between the late 18th and 19th centuries, the introduction of contagious diseases such as smallpox, measles, and venereal infections caused catastrophic devastation among Northwest Coast peoples. Because these populations had no prior exposure to these illnesses, they suffered extremely high mortality rates, with the indigenous population in the region estimated to have declined by as much as 80 percent between 1780 and 1900.1

This massive depopulation profoundly disrupted indigenous society in several ways:

• Social Reorganization: Societies were forced into unusual distributions of roles and status. To maintain social systems, groups utilized adoptions and the allocation of multiple titles to single individuals.1
• Loss of Knowledge: A significant amount of practical and ritual knowledge was lost when elders and those responsible for passing on traditions died prematurely.1
• Cultural Shifts: In response to the social uncertainty and population losses, some groups engaged in increasingly extravagant potlatches to reaffirm or defend their status as houses consolidated.1

The resilience of these peoples in the face of such overwhelming loss remains a central theme in their history, as they adapted to these demographic crises while navigating the pressures of colonialism.21